This conclude the chapters about CSS, pretty interesting stuff eh?

We learned about CSS Filters and how we can modify elements' colors without having to rely on image editing tools. This also applies to CSS Transforms because we can modify the shape and orientation of elements', at least to some extent, quite easily with CSS only.

At the same time we learned about the different ways we can create colors in CSS, and that HSL mode is more intuitive and versatile than any other color mode.

Calculating and declaring different values with the attr() or calc() functions opens new possibilities in our CSS toolbox, for example, how to make responsive tables.

We now know that to improve performance with drop shadows we can use the drop-shadow() function; or to modify the transparency of an element we can use the opacity() function; or the perspective of an element with the perspective() function.

At-rules now make more sense I'm sure. Additionally, we addressed the different font formats and learned that if we don't need to support legacy IEs we can just use WOFF and WOFF2.

And finally, we got clarification on the all the global CSS keyword values like auto or inherit that we use all the time and never really question what they are and how they work.

Note that you don't have to know and remember all the CSS functions, you need to know where to look—this book.